Brake-shoe.



"PA-TENTDED" JUNE 14, 1904.

R. OARDWELL. BRAKE APPLICATION IIL Patented June 14, 1904.

PATENT OFFICE.

JAMES R. CARDWELL, OF OHICAGO, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 762,513, dated June 14,1904.

Application filed October 2, 1902.

To all whom it may concern:

Be it known that I, JAMEs R. CARDWELL, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Brake-Shoes, of whichthe following is a specification.

My invention relates to brake-shoes, and has reference more particularlyto a new and improved brake-shoe-attaching lug for uniting the shoe tothe brake-head.

Brake-shoes as at present ordinarily constructed are provided withacast-iron lug integral with the main body of the brake-shoe, and thisconstruction necessitates the use of a core which has to be made andnailed into the mold, which renders the process of molding somewhatdifficult. Furthermore, it is a well-known fact that cast-ironbrake-shoe lugs are frequently a source of trouble by reason of the factthat sand gets underneath them in the mold, making aninferior orimperfect casting, and being brittle they frequently break in driving inthe key whenattaching the shoe to the brake-head.

By my invention I propose to obviate the objections hereinabovementioned, and this I do through the employment of a lug of wrought ironor steel, which is bent to the required shape and is united with theshoe in the operation of casting the latter, as hereinafter moreparticularly explained.

A brake-shoe embodying my present invention is shown in the accompanyingdrawings, wherein Figure l is a perspective view of the "shoe complete,including the attaching-lug. Fig. 2 is a plan view of the blank fromwhich the lug is made. Fig. 3 is a perspective view of the lug detached,bent and apertured to the required form; and Fig. 4 is across-sectionalview through the shoe-body and its attachinglug, illustrating the mannerin which the latter is permanently keyed or locked into the shoe-body.

In the drawings, A designates a cast-iron brake-shoe of the usual form.

B designates my improved attaching-lug, which is made from a plainrectangular blank Serial No. 125,616. (No model.)

of wrought iron or steel, preferably of oneeighth inch thickness andbent into the U shape illustrated in Fig. 3. The ends of the blank areprovided with apertures b for a purpose hereinafter disclosed.

In the operation of manufacture I provide in the usual brake-shoepattern, at the central portion thereof, a pair of parallel longitudinalslots into which is loosely fitted the two apertured ends of theattaching-lug B. The pattern containing the lug is then placed upsidedown in the .mold, and the sand is pounded over the pattern and into theloop of the lug protruding from the pattern, so that when the pattern isextracted the loop will remain buried in the sand with the two aperturedends protruding into the mold. The molten metal is then poured into themold and flowing around the protruding ends of the lug and through theapertures therein, as shown at (1/, Fig. 4:, securely unites the lug toitself, that portion of the metal a lying within the holes constitutinga key, whereby the lug is locked against the possibility of extractionirrespective of the adhesive effect of the metal of the body upon thesides and edges of the embedded ends of the attaching-lug.

By my invention I provide a brake-shoe wherein the usual integralcast-metal lug,

which, as above pointed out, is liable to imperfections in casting andeasily breaks, is replaced by a wrought metal or steel lug. affordingmuch greater toughness and strength and involving no increased labor .ordifliculty in the molding process, but rather rendering the lattereasier and simpler by dispensing with the usual core, while theprovision of means whereby the integral metal of the body is interlockedwith the metal of the lug renders the latter as secure againstdetachment from the body as in the case of the usual integral cast-metallug. Moreover, by dispensing with the use of the usual core my improvedbrake-shoe can be manufactured at a less cost than the usual cast-metalshoe hav ing an integral cast-metal attaching-lug, thus efiecting amaterial economy in the cost of producing these elements of railwayequipment.

I elaimtaehing-lug; except the inserted ends exposed The combination toform a brake-shoe, of a and pro3eet1ng freely from the shoe-body,subcast-metal shoe-body and a U-shaped wroughtstantially as described.

metal attaching-lug the ends whereof are re- J AMES R. CARDXVELLQ 5eessed, extended directly into the body of the WVitnesses:

shoe and autogenously united therewith by SAMUEL N. POND,

being cast in, and the remainder of the at- J ENNIE NORBY.

